docs: def check_boundary_lines_similar(l_1, l_2):
      """Compare two lists to see if their elements are roughly the same.
      @param l_1: (list) of strings.
      @param l_2: (list) of strings.
      @return: (int) 1/0.
      """
      num_matches = 0
      if (type(l_1) != list) or (type(l_2) != list) or (len(l_1) != len(l_2)):
          # these 'boundaries' are not similar
          return 0
  
      num_elements = len(l_1)
      for i in xrange(0, num_elements):
          if l_1[i].isdigit() and l_2[i].isdigit():
              # both lines are integers
              num_matches += 1
          else:
              l1_str = l_1[i].lower()
              l2_str = l_2[i].lower()
              if (l1_str[0] == l2_str[0]) and \
                      (l1_str[len(l1_str) - 1] == l2_str[len(l2_str) - 1]):
                  num_matches = num_matches + 1
      if (len(l_1) == 0) or (float(num_matches) / float(len(l_1)) < 0.9):
          return 0
      else:
          return 1